Pressure regulating means



p 1931- w. c. BROEKHUYSEN 1,824,389

PRESSURE REGULATING MEANS Filed July 14,-1927 z m w Patented Se a22,

UNITED: STATES PATENT OFFICE MACHINE & FOUNDRY.

a conromrron or NEW mnsmr PRESSURE BEGULATIN MEANS Application fled.7ru1 '14, 1927. Serial No. 205,825.

This invention relates to an improvement in pressure regulating means;and its mam object is the production of a device for applying a givenpredetermined pressure to an object, the device being automatically ren=dered inactive when the predetermined pressure is reached. Anotherobject is the production of such a device especially adapted for use inconnection with a photograph c printing machine in which the print ng isdone by means of an electric arc, and the negative and press plate are*held under pressure during the exposure. With these and other objectsnot specifically mentioned in view, the invention consists in certainconstructions and combinations which will 7 be hereinafter fullydescribed and then specifically set forth in the claims. hereuntoappended. I

go In the accompanying drawings, in WhlCh like characters of referenceindicate the same or like parts, Fi 1 is an elevation,

partly in section, of a evice constructed in accordance with theinvention and supported 85 by the pressure arm. of a photographicprlnting machine; Fig. 2ois a plan view, I artly in section, of thestructure shown in ig. 1; Fig; 3 is an enlarged plan view of the motorreversing switch seen at the top .of

.30 Fig. 1; and Fig. 4 is a diagram of the of the device.

is-provided motor driven means for apply ing pressure, and controllingmeans automatically governingthe actionof 'said'applying means inaccordance with predeter mined pressure; and when the device is to beused in connection with a hotographic rinting machine, both of sai-means may be supported by the pressure arm of said machine, and thearclight of sililild machine contro 'ngmeans.

' may be governed by sai In the best constructions contemplated, theappl ing means includes a movable J ressure member and a fingercarried.there y, and the controlling means includes a motor reversing switchactuated b said 'fingeg; the controlling means further includes aweight- 50 ed lever and a coasting rock lever keeping electricalconnections showing the operation In carrying the invention into effect,therethe applying means iii action only until the predetermined pressureis reached. The above mentioned means andpartsma be considerably variedin construction within the scope of the claims, for the s ecificstruc-,- ture selected to illustrate the invention is but one ofnumerous possible concrete embodiments of the same. The inventionthere-- fore is not to be restricted to the precise details of thestructure shown and described.

Referring to the drawings, 5 indicates the swinging pressure arm of thewell known Ogden photographic printing machine, and in the outer end ofthis arm is mounted a pressure plunger 6 by means of which a sensitizedpress plate and a negative are pressed together upon the glass plate 7before exposing the same tojthe action of the arm lamp 8 placed belowit.

. Supported by --the arm 5 is an electricmotor 9, which, preferably, isa single-phase motor having a separate starting coil with a centrifugalcutout. A splined coupling 10 connects 'the shaft of the motor 9 withthe driven shaft 11, so that the shaft 11 may be moved axially whilebeing revolved by the motor 9. On the shaft 11, to move with it ismounted a worm 12 which, in the central long'tudinal position of theshaft 11, meshes wit a worm wheel 13 on a illlaft 14,. the lat-.ter'carry' a inion 15 mes 'n with a ur gear 16.dii a saft 17. The sha ft17 ca i'ies a pinion 18 engaging a rack 19, formed in the plunger 6before referred to. The shafts 11, 14 and 17 are supported by a gearhousin 20 on the arm 5.

p'on the floating shaft 11 is mounted a box 21 containing a thrustbearing 22 to take up the end thrust of the shaft 11 and which hastrunnions 23 engaging forked levers 24 mounted on the fulcrum 25 of aT-lever 26, which on its two ends, carries rollers 27. The'shaft 25 issupported by a bracket 28 fastened to the arm 5, and the bracket 28carries a fulcrum 29 for a weighted lever'30 which is so mounted thatwhen in 'its horizontalv 'tion it en both rollers 27 of the -lever 26wh1ch is then I in its neutral position. I

- Mounted on the long end of the'lever is a slide 31 carrying anadjustable weight 32, by means of which the pressure to be applied maybe regulated. The-short end of the lever carries a movable counterweight33 which serves for finer adjustment of the effect of the weight 32.

At the heavily weighted end of the lever 30 is fastened a contact-maker34 which engages a control switch 35 attached to the pressure arm 5. Theswitch 35 has four contact springs 36, 37, 38 and 39 insulated from oneanother and so arranged that upward movement of the contact-maker 34first, closes the contact of the springs 38 and 39, and then opens thecontact of the springs 36 and 37, and the downward movement of thecontact-maker 34 first closes the contact 36-37 and then opens thecontact 38-39.

Upon the top of the pressure plunger 6 is mounted a finger 40 whichengages a forked lever 41 of the motor reversing switch 42 mounted uponthe gear housing 20. A plan view of the switch 42 is shown in Fig. 3.The lever 41 is connected with a cross bar 43 by a rod 44, which ispivoted thereto and slidable in theinner end of the lever 41. To thecross bar 43 are secured the ends of two flat contact springs 45, theirstationary ends being attached to the upright sides of a U-shapedinsulating block 46 and being provided with terminals 47. A coil spring48 inserted between the pivots of the rod 44 is placed under compressionby either movement of the lever 41 and swings the ends of the springsinto contact with the upper pair of terminals 49 when the rod moving endof the lever 41 is down, and into contact with the lower pair ofterminals 50 when the 'lever 41 is up, the terminals 49 and 50 beingattached to the insulating upright 51 of the switch.

In the diagram (Fig. 4) of the electrical connections, 52 indicates thetwo lead-in wires of the single-phase supply circuit, the wires beingmarked with the positive and negative signs for identification infollowing up the circuits. 53 indicates the pro-' tecting fuses, 35 thepressure control switch, and 42 the motor reversing switch. 54 and 55are push buttons, 56 is the electro-magnetic motor operating switchcontrolled by the coil 57, and 58 is the electromagnetic arc circuitswitch, controlled by the coil 59. 6061 is a double relay controlled bythe coils 62 and 63. 64 is the timer for the arc-circuit, controlled bythe coil 65. 66 is the main-winding of the motor 9, 67 itsstarting-winding, and 68 the centrifugal cutout of the motor whichdisconnects the starting-winding by automatically opening a contact whenthe motor is running.

I The operation of the device is as follows: When the machine is notoperating, the pres sure plunger 6 is up, the finger 40 through thelever 41 having set the reversing switch motor 9 by energizing itsmain-winding 66,

its starting-winding 67 being in circuit through the switch 42. Thesubsequent turning ofthe worm 12 by the motor 9 causes an outwardmovement of the driven shaft 11, thereby bringing, through the trunnions23 and arms 24, the lever 26 into its neutral position and permittingthe weighted end of the lever 30 to descend, closing the contact 36 andopening the contact 39. The current now passing to the coil 57 throughthe contact 36-37, the push button 54 can be released without therebystopping the motor 9, which will keep on running and driving the gears12, 13, 15, 16, 18 and 19, until'the plunger 6 has reached its operatingposition under full pressure, whenthe resistance of the load justbalances the'turning moment of the weight 32. On its way down, thefinger 40 attached to the plunger 6 engages the lever 41 the switch 42,thereby reversing the same, so that the motor after having stopped willthen start in the opposite direction. The motorwill not reverse whilerunning because then the starting coil 67 is disconnected by the actionof the centrifugal cutout 68. As the plunger 6 attains its full workingpressurepthe gears 19. 18, 16, 15 and 13 are locked by the stoppage ofthe plunger. Therefore, the worm 12 and shaft 11 travel forward, turningthe T-lever 26 and raising the weight end of the lever 30. This movementof the lever 30 opens the contact 36, thereby stopping the motor 9, butfirst closes the contact 39 allowing current to flow through the coil 59by way of the contact 49 of the switch 42, thereby closing theelectromagnetic switch 58 and starting the arc 8,-and also putting thetimer coil 65 into circuit. At the end of the time operating period, thetimer contact 64 closes, thereby energizing the coil 62 of the relay andclosing the contact 60 of the same, so that now current can flow throughthe. coil 57 from the switch 58, thereby closingthe switch 56 and againstarting the motor 9. The latter, since the switch 42 has been reversedby the down coming of the plunger 6, this time runs in the oppositedirection, thereby moving back. the shaft 11. This backward movement ofthe shaft 11' turns the lever 26 into neutral position, allowing theweighted end of the lever 30 to descend,

thereby closing the contact 36 and opening 1351 the contact 39. Thebreaking of the contact 39 interrupts the current in the coil 59 andopens the switch 58, thereby stopping the are 8; the closing of thecontact 36 sends current through the coil 57 on opening of the switch 58and keeps the motor 9 running, so that now it will raise the plunger 6.When the latter has arrived at its uppermost position, the finger 40actuates the lever i1, thereby reversing the switch 42 and the shaft 11,upon stoppage of the plunger 6 by the stop screw-69, moves backwardturning the T-lever 26 and raising the weighted end of the lever 30,thus bringing all switches and contacts .back into their originalpositions at the starting of the operation.

The coil 59 of the electromagnetic switch 58 is connected to that sideof the reversing switch 42 which is in circuit when the motor 9 israising the plunger 6, so that the switch 58 will always be open whenthe switch 42 is set for downward operation of the plunger, and the arccircuit cannot be closed until the switch 42 has been reversed on thedownward travel of the plunger.

The coil 63, which is in series with the are 8, closes the contact 61 incase of overload in the arc circuit, thereby opening the switch 58 andstopping the arc.

The push button 55, which is normally closed and'opens when depressed,serves as a cutout if the operator wishes to stop the motor during theoperation of the device.

The thread angle of the worm 12 is small enough to make the wormself-locking in the worm wheel; otherwise the pressure on the plungerwould be released when the driving force is shut off by stoppage of themotor. The direction of the worm thread,

right or left handed, is preferably so chosen that the worm whenadvancing the plunger into load position, travels in the direction ofthe weight 32 toward the fulcrum 29 of the lever 30, because in thiscase the end thrust on the shaft 11, due to the pressure exerted by theplunger, is communicated to the lever 30 thi'ough the end of the lever26 nearest the fulcrum 20 of the lever 30, so that a much smaller weight32 is sufficient for a given pressure than would be required if thethrust were to act on the longer leverage due to the farther end of thelever 26.

What is claimed is:

1. The combination with motor driven means for applying pressure, ofpressure actuated motor reversing means automatically governing theaction of said applying means.

2. The combination with motor driven means for applying pressure, ofpressure actuated motor reversing means automatically governing theaction of said applying means, said applying means including a movablepressure member and a finger carried thereby, and said controlling meansincluding a motor reversing switch actuated by said finger.

3. The combination with motor driven means for applying pressure, ofpressure actuated motor reversing means automatically governing theaction of said applying means, said controlling means including aweighted lever and a coacting rock lever keeping the applying means inaction only until the predetermined pressure is reached.

4. The combination with motor driven means for applying pressure, ofpressure actuated motor reversing means automatically governing theaction of said applying means, said applying means including. a wormwheel and anactuating worm, and said controlling means including meansfor holding said worm wheel and said worm in mesh only until the load onthe worm wheel reaches a predetermined limit.

5. The combination with a motor having a driving shaft, of a drivenshaft, a splined coupling connecting said shafts, a worm carried by thedriven shaft, a worm wheel normally driven by said worm, and means forholding said worm wheel and said worm in mesh only until the load on theworm wheel reaches a predetermined limit.

6. The combination with a motor, of a worm driven by said motor, a wormwheel normally driven by said worm, and a weighted lever and coactingrock lever holding said worm wheel and said worm in mesh only until theload on the worm wheel reaches a predetermined limit.

7. The combination with a motor having a driving shaft, of a drivenshaft, a splined coupling connecting said shafts, a worm carried by thedriven shaft, a worm wheel normally driven by said worm, and a weightedlever and coacting rock lever holding said worm in mesh only until theload on the worm wheel reaches a predetermined. limit.

8. The combination with motor driven means for applying pressure, ofpressure actuated motor reversing means automatically governing theaction of said applying means, said pressure actuated means beingoperative to maintain a predetermined pressure for a definite period oftime only.

9. The combination with motor driven means for applying pressure, ofpressure actuated means automatically governing the action of saidapplying means to maintain a predetermined presusre for a definiteperiod of time only. i

10. The combination with motor driven means for applying pressure, ofpressure actuated means automatically governing the action of saidapplying means to maintain a predetermined pressure for a definiteperiod of time only, said pressure actuated means including motorcontrolling mechanism.

11. The combination with motor driven means for applying pressure, ofpressure actuated means automatically governing the action of saidapplying means to maintain a predetermined pressure for a definiteperiod of time only, said pressure actuated means including motorreversing mechanism operative at'the end of said period.

12. The combination with motor driven means for applying pressure, ofpressure actuated means automatically governing the action of saidapplying means to maintain a predetermined pressure for a definiteperiod of time only, the'motor driven means including a drive train andthe pressure actuated means including mechanism incapacitating the drivetrain.

13. The combination with motor driven means. for applying pressure, ofpressure actuated means automatically governing the action of saidapplying means to maintain a predetermined pressure for a definiteperiod of time only, the pressure actuated means including means forreversing the action ofthe applying means after said period.

14. The combination with means for applying pressure, of an electricmotor for driving said means, and pressure actuated means automaticallygoverning the action of said applying means to maintain a predeterminedpressure for a definite period of time only, said pressure actuatedmeans including a reversing switch for the motor.

15. The combination with means for applying pressure, of a motor, adrive train response to a predetermined load, and means actuated, by themovement of said element controlling the motor, said mechanismpermitting movement out of driving engagemen; of the element.

17. The combination with pressure applying means, of a motor foroperating said applying means, and pressure actuated motor controllingmeans to automatically stop themotor and after a predetermined periodstart the same in reverse direction.

plying pressure, of motor actuated drive means operating said applyingmeans, mechanism incapacitating said drive means in response to apredetermined load and motor controlllng means operated by said mechanism.

the other. 18. The combination with means for aptuated motor reversinmeans automatically governing the action 0 said applying means, and thepressure arm of printing machine supporting both of said means with saidapplying means in position to exert pressure on photographic printingelements in said machine.

20. In a photographic printing machine,

a photographic the combination with motor driven means plunger of aphotographic printing machine positioned to exert pressure onphotographic printing elements in said machine, and reduction gearingconnecting said plunger and the motor of said applying means.

22. The combination with motor driven means for applying pressure, ofpressure ac- 'tuated motor reversing means automatically governing theaction of said applying means, said applying means including thepressure plunger of a'photographic printing machine in position to exertpressure on'photographic printing elements in said machine, andafloating worm drive connecting said plunger and the motor of saidapplying means and governed by said controlling means.

23. In a photographic printing machine, the combination with motordriven means for applying pressure to photographic printing elements insaid machine, of pressure actuated means automatically governing theaction of said applying means, and an are light for said machine, saidgoverning means including common means for starting the arc and stoppingthe motor.

24. In a photographic printing machine,

the combination with motor driven means for applying pressure tophotographic printmg elements in said machine, of pressure actuatedmeans automatically governing the action of said applying means, an arelight for said machine, said governing means in cluding a motorcontrolling switch, an arcconirolling switch, and common means tosimultaneously open one switch and close In testimony whereof, I havesigned my name to this specification.

WILLIAM C. BROEKHUYSEN.

